|Number of teams||336 (in 2018/19)|
|Level on pyramid||5|
|Promotion to||III liga|
|Relegation to||Liga okręgowa|
4 liga (Czwarta Liga) is the 5th level of the Polish football league system. The current structure of IV liga was created in season 2000/01 after introducing new administrative division of Poland. 16 clubs, one from each voivodeship (province), are promoted to III liga. The bottom clubs are relegated to Liga okręgowa.
Until the end of the 2007/08 season IV liga lay at 4th tier of league system but this was changed with the formation of the Ekstraklasa as the top level league in Poland.
In 2018/19 season there are 20 parallel groups of IV liga. There are two groups in 4 voivodeships but only one club can be promoted after winning the play-offs between the winners of these two groups.
- dolnośląska (Lower Silesia) - 2 groups
- kujawsko-pomorska (Cuyavia-Pomerania)
- lubelska (Lublin)
- lubuska (Lubusz)
- łódzka (Łódź)
- małopolska (Lesser Poland) - 2 groups
- mazowiecka (Mazovia) - 2 groups
- opolska (Opole)
- podkarpacka (Subcarpathia)
- podlaska (Podlasie)
- pomorska (Pomerania)
- śląska (Silesia) - 2 groups
- świętokrzyska (Holy Cross)
- warmińsko-mazurska (Warmia-Masuria)
- wielkopolska (Greater Poland)
- zachodniopomorska (West Pomerania)
The table that follows is accurate as of the end of the 2017/18 season. It includes all the clubs that played at least one match (even annulled) in IV liga from each group.